ci: ios swift6 xcodegen

[armcknight]

Following #5115, extracting more projects out of the old iOS-Swift xcode project (which really housed multiple separate apps–this separates each one's project spec) to be generated by xcodegen

#skip-changelog; for #5165

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                         Coverage Diff                          @@
##             armcknight/ci/ios-swift-xcodegen     #5116   +/-   ##
====================================================================
  Coverage                                    ?   92.785%           
====================================================================
  Files                                       ?       677           
  Lines                                       ?     84417           
  Branches                                    ?     30706           
====================================================================
  Hits                                        ?     78327           
  Misses                                      ?      5988           
  Partials                                    ?       102           

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[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	1232.36 ms	1257.33 ms	24.96 ms
Size	22.30 KiB	852.06 KiB	829.75 KiB

[armcknight]

I'm not sure how this even worked before. It seems to have been targeting the wrong test target 🤔